1990943 has 4 divisors (see below), whose sum is σ = 2037288. Its totient is φ = 1944600.

The previous prime is 1990939. The next prime is 1990951. The reversal of 1990943 is 3490991.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1990943 - 2² = 1990939 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1990973) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 23108 + ... + 23193.

It is an arithmetic number, because the mean of its divisors is an integer number (509322).

2^1990943 is an apocalyptic number.

1990943 is a deficient number, since it is larger than the sum of its proper divisors (46345).

1990943 is an equidigital number, since it uses as much as digits as its factorization.

1990943 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 46344.

The product of its (nonzero) digits is 8748, while the sum is 35.

The square root of 1990943 is about 1411.0077958679. The cubic root of 1990943 is about 125.8016320982.

The spelling of 1990943 in words is "one million, nine hundred ninety thousand, nine hundred forty-three".